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Bismuth MOFs based hierarchical Co3O4-Bi2O3 composite: An efficient heterogeneous peroxymonosulfate activator for azo dyes degradation
Separation and Purification Technology ( IF 8.1 ) Pub Date : 2020-03-12 , DOI: 10.1016/j.seppur.2020.116825
Zishun Li , Xuekun Tang , Ganghong Huang , Xianping Luo , Dongsheng He , Qian Peng , Jing Huang , Minlin Ao , Kun Liu

A hierarchical Co3O4-Bi2O3 composite was first prepared via an adsoption-calcination method using a bismuth-based MOF (Bi-BTC) as the precursor and substrate. In the composite, Co3O4 nanoparticles are loaded on the outer layer of Bi2O3 rods derived from Bi-BTC and show a uniform honeycomb-like morphology. In dyes degradation tests, the Co3O4-Bi2O3 composite exhibits much better peroxymonosulfate (PMS) activation performance in RhB degradation than pure Bi2O3 or Co3O4. The Co3O4-Bi2O3/PMS system also shows high performance for various azo dyes and maintains good catalytic performance at wide pH range. Besides, the good chemical stability of Co3O4-Bi2O3 ensures it good reusability in four recycling tests. XPS and electrochemical analysis indicate the interaction of Bi species promotes the activation capacity of Co3O4 nanoparticles. The results of radicals quenching tests and ESR analysis reveal the singlet oxygen and superoxide radicals are the dominant functional radical species in Co3O4-Bi2O3/PMS system and subsequently a reasonable activation mechanism is proposed.



中文翻译:

基于铋MOF的分层Co 3 O 4 -Bi 2 O 3复合材料:一种高效的均相过氧单硫酸盐活化剂,用于偶氮染料的降解

首先,采用基于铋的MOF(Bi-BTC)作为前体和底物,通过吸附-煅烧方法制备了分层的Co 3 O 4 -Bi 2 O 3复合材料。在复合材料中,Co 3 O 4纳米颗粒负载在源自Bi-BTC的Bi 2 O 3棒的外层上,并显示出均匀的蜂窝状形态。在染料降解测试中,与纯Bi 2 O 3或Co 3相比,Co 3 O 4 -Bi 2 O 3复合物在RhB降解中表现出更好的过氧单硫酸盐(PMS)活化性能。O 4。Co 3 O 4 -Bi 2 O 3 / PMS系统还对多种偶氮染料显示出高性能,并在宽pH范围内保持良好的催化性能。此外,Co 3 O 4 -Bi 2 O 3的良好化学稳定性确保了其在四个循环测试中的良好可重复使用性。XPS和电化学分析表明Bi物种的相互作用促进了Co 3 O 4纳米颗粒的活化能力。自由基猝灭测试和ESR分析的结果表明,单线态氧和超氧化物自由基是Co 3 O中主要的功能自由基提出了4- Bi 2 O 3 / PMS系统,并提出了合理的活化机理。

更新日期:2020-03-12
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